Improvement in the manufacture of nails for horseshoes



UNITED FFICE.

ALEXANDER E. cAEYL, or GEoToN, MASSACHUSETTS.

A IMPROVEMENT IN THE MANUFACTURE OF NAILS FOR HORSESHOES.

Specification forming part of Letters Patent No. 117,148, dated July 18, 1871.

To all whom it may concern:

Be it known that I, ALEXANDER H. OARYL, of Groton, in the county of Middlesex and State of Massachusetts, have invented an Improvement in the Manufacture of Horseshoe-Nails; and I do hereby declare that the following, ta-ken in connection with the drawing which accompanies and forms part of this speciiication, is a description of my invention, sufficient to enable those skilled in the art to practice it.

My invention relates particularly to a method f of hardening or stiffening the Shanks of horseshoe-nails.

Hot forged machine hammered horseshoenails, though superior in most respects to all other machine-made nails, do lack the requisite or desirable stiffness. And other cut and hotforged horseshoe-nails are deficient in the desirable and requisite rigidity. To remedy this I roll the opposite edges of the shank, when cold, of a wrought nail, nished as to shape, and such edges alone, in tapering grooves between two cylindrical rolls, the cylindrical faces of which meet, the nail being held in position so that its head is seized in two vertical slots or recesses in the vopposite rolls and by two shoulders of said recesses, the diegrooves or dieygroove faces then seizing or biting upon the two vertical shafts journaled therein, one of the shafts being journaled directly in the frame and the other in or against sliding bearings, which are supported against strong solid or block rubber or other elastic material rv, held in place by pistons or slides f, against the ends of which setscrews g are forced, these screws workingthrough nut-threads in a plate, h,'which plate is bolted to the frame by bolts i. At the top ofthe shafts b c isa pair of die-cylinders or rolls, k l, each roll .having a peripheral die-groove, m or n, extendingfrom a slot or recess, o. The bottom of each g cylinder rests on the top of the frame a, and the die-rolls are tiu'ned and the shoulders strike the head and move it forward until the die-surfaces bite upon the opposite edges ofthe shank, when they will carry the shank forward, rolling it down and condensing and hardening the edges as they roll, so that when the nail is fed through the shank will have been made hard and rigid by reason of such rolling of its edges. The nails are received from the dies upon a table or guideplate, r. rIhe shaft of one roll is driven from the other by two gears, s t, and, to prevent backlash and keep the grooves in proper relative position, I make each of these gears with twist or skew-teeth, as seen in the drawing.

Each cylinder is made with two die-grooves in the same horizontal pla-ne, so that at each rotation of the cylinders two nails can be hardened. Each cylinder is also formed with a vertical series of die-grooves, placed at a short distance apart, as seen in the drawing, all the grooves of any one series opening from the same headreceiving slot or recess. By this construction the grooves of severa-l series may be all turned while the cylinder is once in the lathe, while as either pair of grooves becomes worn so as to be ineffective, or not properly or fully eifective, the ends of the cylinders may be turned or planed otf until the next pair is brought into proper position relatively to the end of the cylinder.

Cutting-edges may be connected with the rolls to clip olf the superduous metal at the point of each nail.

I do not claim, broadly,the treatment of metals by cold rolling 5 nor do I claim anything shown or described in Polseys patent No. 92,355; but

I claim- As my improvement in the manufacture of horseshoe-nails, the process of taking a wrought nail finished as to shape, and then cold rolling its edges, and its edges alone, in dic-grooves, substantially as described.

A. H. CARYL.

itnesses A. H. CAEYL, Jr., S. A. HAMLIN. 

